| 摘要 |
<p>The present invention relates to the use of tocopherol as a co-catalyst in the ring opening polymerisation of cyclic siloxanes. The present invention further relates to a method for manufacturing hydrophilic polysiloxanes, wherein a hydrido- containing cyclic siloxane is reacted with a hydrophilic molecule comprising a carbon-carbon double bond, having the general formula (I) H<SUB>2</SUB>C=CH-(CHR)<SUB>n</SUB>-O- (CHR<SUP>1</SUP>CR<SUP>2</SUP>R<SUP>3</SUP>)<SUB>m</SUB>R<SUP>4</SUP> or (II) H<SUB>2</SUB>C=CH-(CHR)<SUB>n</SUB>-R<SUP>5</SUP>, wherein n is an integer from 0 to 4, m is an integer from 0 to 5, R, R<SUP>1</SUP>, R<SUP>2</SUP>, R<SUP>3</SUP> and R<SUP>4</SUP> are each independently hydrogen or a C<SUB>1</SUB> to C<SUB>6</SUB> alkyl, R<SUP>5</SUP> is a saturated cyclic hydrocarbon containing carbonyl group, in the presence of a first catalyst to obtain a monomer, and polymerising said monomer in the presence of a second catalyst and tocopherol as a co-catalyst.</p> |
